Essilor PRO-E 600 - Page 89

Remove the adjustable wrench then the mill bit.
Inset the new mill bit all the way at the back.
Put the adjustable key onto the chuck, then tighten (two notches towards the bottom of the trough).
The chuck tightens up.
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USER MANUAL> IV. MAINTENANCE & SERVICING
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Pro-E 600 > v1 -02.17